Without debating the whole new vs reuse fluids...

Changing filters and possibly reseting adaptations will many times fix or lessen the slam, but to be fair some people say reseting adaptations and full fluid change can speed up the death of your transmission.

Hopefully your milage won't vary... [emoji1787]

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course